Re: [webcomponents] Support renaming, aliasing, or namespacing imported elements (#344)

It would be great if could use separate registries. I mocked up a [JSBin of it in action](https://jsbin.com/demujugixa/edit?html,output), where there are two `my-element` with different prototypes, though as you've said, innerHTML and CSS is still an issue. Should this even work, or is it just a hack that may break in the future?

Also, and perhaps this is a discussion for another thread, but in the above example I was forced to use an iframe, rather than something like `document.implementation.createHTMLDocument` as only in the iframe did the registry appear unique. Should creating a new HTMLDocument have a unique registry?

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https://github.com/w3c/webcomponents/issues/344#issuecomment-166766914